Loot from the Beastmaster during the side quest Free Hendak and the slaves; can also be obtained by exposing Hendak's escaping plan to Lehtinan then agree to kill Hendak. Required to open the slave holding cells.
Note: The Beastmaster will not spawn once you have the key.
Description[]
| “ | The beastmaster's key should open the cells of the gladiators. | ” |